First came the crotch photos. Then came the lying and denial. Now, Rep. Anthony Weiner is seeking treatment for his misdeeds, leaving Washingtonians asking: treatment for what? Based on the New York Democrat’s behavior, which the congressman says includes sending lewd messages and images over the Internet to six women in the past three years, experts interviewed by POLITICO said he could suffer from an array of conditions that could merit treatment, including narcissism, obsessive-compulsive disorder or even some variety of sexual addiction. None of the possibilities comes with a silver-bullet treatment that delivers quick results — meaning that if...